Islam Shahwan, a Hamas Interior Ministry spokesman, said the campaign promised amnesty for collaborators who surrender willingly.
In its second part, the campaign involves public programs to raise awareness against aiding Israel with information, he said.
In 2007, Hamas took over Gaza after routing security forces loyal to President Mahmoud Abbas of the rival Fatah movement. Since then, Hamas prides itself on "cleaning" the coastal enclave from Israel's eyes.
But in subsequent waves of cross-border fighting with Israel, Israeli airplanes identified and hit several Hamas targets, including senior military and political leaders who used to move in disguise and secretly, such as Interior Minister Said Siam and Hamas' military chief Ahmed al-Jaabari.
Hamas blames the collaborators for helping Israel allocating its bank of targets. During the eight-day clash between Hamas and Israel in November 2012, which was sparked after the killing of al- Jaabari, Hamas executed seven collaborators in the streets, some of them summarily, in addition to 14 others who were executed after complete trials over the past three years.
The new campaign against spying is the second of its kind that Hamas launches. Shahwan said that in 2010, about 30 collaborators handed themselves over to his ministry.
- 01/04/2015 Iran nuclear talks may go beyond deadline to April 1: US diplomat
- 01/04/2015 At least 62 children killed in Yemen violence over past week
- 01/04/2015 Saudi forces and Houthi fighters exchange heavy fire on border - residents
- 31/03/2015 Iraqi forces take back Tikrit from ISIS, official says
- 31/03/2015 Japan extends sanctions on North Korea by two years
- 31/03/2015 Iran says new proposals on outstanding issues possible at Lausanne negotiations
- 31/03/2015 Coalition planes strike air defense camp in Yemen's Taizz
- 31/03/2015 Assad: Turkey supports ISIL in Syria
- 30/03/2015 Security forces continue clashes with IS militants in Iraq
- 30/03/2015 At least 4 injured in SW China earthquake
- 30/03/2015 CEC: Karimov wins Uzbek presidential election with 90.39% of votes
- 30/03/2015 Bombing continues, Arab leaders urge Yemen's Houthis to withdraw from capital
- 30/03/2015 Earthquke revised to 7.7-magnitude quake in 54km SE of Kokopo, Papua New Guinea
- 30/03/2015 Gunmen assassinate Pakistan's army officer
- 30/03/2015 30 IS militants killed in Iraqi clashes, airstrikes
- 30/03/2015 Security forces kill five militants in SW Pakistan
- 30/03/2015 Iran, powers explore nuclear compromises, Israel alarmed
- 29/03/2015 Fighting and air strikes across Yemen, dialogue remains distant
- 29/03/2015 3 killed in suicide attack in Afghan capital
- 29/03/2015 Air strikes cripple Yemen capital’s airport
- 29/03/2015 Turkey denies asking to attend Arab League summit
- 29/03/2015 5.8 magnitude quake strikes off Gorontalo, Indonesia
- 29/03/2015 Voting for presidential election begins in Uzbekistan
- 29/03/2015 Iran's Rafsanjani condemns Saudi-led airstrikes in Yemen
- 29/03/2015 Iraqi forces kill 74 Daesh militants
- 29/03/2015 Death toll in central China mine flood rises to
- 28/03/2015 Tripartite meeting on Iran’s nuclear issue held in Lausanne
- 28/03/2015 Zarif: Iran makes political decision to get into agreement with P5+1
- 28/03/2015 Dozens killed in explosions at arms depot in Yemen's Aden
- 28/03/2015 Yemeni President accuses Iran of arming Houthis
- 28/03/2015 Saudi king says Yemen campaign to continue until achieves targets
- 28/03/2015 Eight security personnel, 4 militants killed in Pakistan
- 28/03/2015 Former Yemeni President Demands for Saudi-led Coalition
- 28/03/2015 Lebanese army seize strategic border sites from militants
- 28/03/2015 UAE warplanes took part in Yemen strikes: coalition
- 28/03/2015 Iraq paramilitaries decide Tikrit pullback
- 28/03/2015 8 children wounded by cluster bomb in south Lebanon
- 27/03/2015 Yemen Houthi rebels advance despite Saudi-led air strikes
- 27/03/2015 Warships move in key strait as airstrikes widen in Yemen
- 27/03/2015 Iran accuses Turkish leader Erdogan of fomenting regional strife